Sing like a Catholic. Sing the Mass.

Although Lewis writes about the use of the vernacular for the Church of England, his insight is helpful for Roman Catholics, too.

As to the words of the service – liturgy in the narrower sense – the question is rather different. If you have a vernacular liturgy, you must have a changing liturgy: otherwise it will finally be vernacular only in name. The ideal of “timeless English” is sheer nonsense. No living language can be timeless. You might as well ask for a motionless river.

I think it would have been best, if it were possible, that necessary change should have occurred gradually and (to most people) imperceptibly; here a little and there a little; one obsolete word replaced in a century – like the gradual change of spelling in successive editions of Shakespeare. from The Joyful Christian